C PRACTICAL/AREA OF CIRCLE

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>> /* WRITE A C PROGRAM TO USE SYMBOLIC CONSTANT.(AREA OF CIRCLE) */

#include<stdio.h>

#include<conio.h>

#define PI 3.14

void main()

{

   float r,ans;

   clrscr();

   printf("enter your radius : \n");

   scanf("%f",&r);

   ans = PI*r*r;

   printf("area of circle is : %f\n",ans);

   getch();

}

   /*  OUTPUT  */

====================

enter your radius :

2

area of circle is : 12.560000

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